Anchor groove forming device for concrete structures



y 1943- I w. c. JOHNSON 2,318,692

ANCHOR GROOVE FORMING DEVICE FOR CONCRETE STRUCTURES Filed Feb. 27, 1942 10 7 i 3 1t F2 4.

Patented May 11, 1943 UNITED STATES PATENT, ICE

ANCHOR GROOVE FORMING DEVICE FOR CONCRETE STRUCTURES William C. Johnson, Winterset, Iowa Application February'27, 1942, Serial No. 432,592

3 Claims. (01. 25-131) In the art of constructing brick veneered concrete walls it is customary toplace in the mould for forming the concrete wall a series of metal trough shaped strips, narrowest at their outer edges. Then, when the concrete has set and hardened and the mould form removed, these metal strips form grooves with their open sides flush with the surface of the wall and into which anchor devices may be easily inserted and held against outward movement away from the wall. Then, when a brick veneer wall is being laid, the anchor members are laid in the mortar between the bricks, thereby firmly holding the brick veneer to the concrete wall.

Due to the present National Defense Program I am unable to obtain the necessary sheet metal for forming such channels in quantities sufiicient for completing the buildings upon which I am at present engaged, and this situation prevails in many localities.

The object of my invention is to provide an anchor groove forming device for concrete walls, whereby tapered grooves narrowest at the surface of the concrete and adapted to receive the ordinary anchor members, may be readily and easily formed without the use of metal channels or the like.

More specifically, it is my object to provide a tapered groove forming strip made of wood or other cheap available material and which may be nailed to the form boards and which is made of a number of independent members held together by easily separable means, and whereby when the cement wall has set and hardened, the independent strip members may be readily and easily removed one at a time, thereby forming the groove of the desired shape for receiving and holding anchor members.

In the accompanying drawings Figure 1 shows a perspective view of an anchor groove forming device embodying my invention;

Figure 2 shows an end view of same showing a modified form;

Figure 3 shows a similar view of another modification;

Figure 4 shows a similar view of another modified form;

Figure 5 shows a sectional view of a part of a concrete wall and form board and having my anchor groove forming device in the concrete and nailed to the form board;

Figure 6 shows a sectional view of a part of a concrete wall and a brick veneer wall with an.

anchor in the groove in the concrete and ex tended over the back wall; and

Figure -7 shows an end View illustrating another modification of the anchor groove forming device.

Referring to the accompanying drawing:

The slot forming strip is shown to be formed of three wooden strips. The centralone, I0, is preferably tapered at its sides so that its outer edge is narrower than its inner edge which is to be at the bottom of the groove. On each side of the strip member I0 is a strip member II preferably of triangular shape in cross section. The strip members I I are secured to the strip member ID by small brads I3 which are sufiicient to hold the stop members together while being han dled and nailed to the form boards, but which permit the strip member ID to be easily released and drawn out from between the strip members II.

In the modified form shown in Figure 2 I have provided a central longitudinal saw cut I4 in the strip member I0, and similar saw cuts I5 in the strip member II. These saw cuts are useful in cases where the cement adheres to the wooden strip in an unusual degree, and the saw cut I4 permits .the opposite sides of the strip member I 0 to be bent toward each other and broken away from the cement for easy removal, The saw cuts I5 permit the insertion of a tool for splitting the strip members II to thereby make them easily removable.

In the modified form shown in Fig. 3 the strip members I 6 are shaped to form square shoulders on the interior of the groove in the concrete wall, and yet are easily removable after the central strip member has been removed.

In the form shown in Fig. 4 the strip members are not held together by brads, but by a coating ll of a waxy nature applied in the form of a liquid and permitted to set and harden. Commercial ealing wax may be used for this purpose. This coating performs the double function of holding the strip members together and at the same time making them easily removable from the cement. It greatly lessens the adherence of the concrete to the strip.

The concrete wall form boards I8 are placed in position and the strips are secured to the inner surface thereof by nails I9 extended through the strip members I0.

I have found in practice that when the concrete is poured it will cause the wooden strips to swell before it sets and hardens. After setting and hardening the wooden strips shrink and break their bond with the concrete so that they are easily removed. The strips are only In all of the modified forms of my invention,-

and when the strips of wood are removed, outwardly extending shoulders 2| are formed near the base of the groove to be engaged by the heads of the anchors.

Anchor members such as shown at 20 may have their heads inserted in the slot, then turned to horizontal position where they will firmly en gage the tapered side of the slot, and when placed in the mortar between the bricks of a wall they will firmly hold the wall to the concrete.

In the accompanying claims I have defined the material of the strips as being wood. Other materials having similar characteristics may be substituted. 1 r

' In practice I have found that after the removal of the wooden strips the resultant slot is free from concrete and the anchor members may be easily inserted and firmly anchored, in contrast to the use of sheet metal channels which frequently leaked and permitted the thin liquid portions of the concrete to enter the channel and which had to be removed before the anchors could be firmly set in position in the grooves.

I claim as my invention:

1. An anchor groove forming device for concrete walls, comprising a central strip member, a strip member at each side thereof adjacent the inner edge of the central strip and a coat of hardened easily breakable material adhering to and surrounding the sides of the strip for the combined purpose of holding the strips together and minimizing the adherence of concrete thereto.

2. An anchor groove forming device for concrete structures, comprising a central wooden strip having a fiat outer surface adapted to be secured to a concrete mould form, a wooden strip detachably connected to each side of the central strip at a point spaced apart from the outer surface of the central strip and in close contact with the central strip, whereby when concrete is being poured into the mould form it cannot enter between the mould form and the flat surface of the central strip, nor between the engaging surfaces of the side strips with the central strip.

3.'An anchor formingdevice for concrete structures, comprising a wooden strip having its sides tapered to provide a strip thickest at its outer face, and a substantially triangular wooden strip at each side thereof adjacent its narrow edge, small brads'inserted through the side strip into the central strip for temporarily holding them together and whereby when the combined groove-forming members are embedded in a concrete wall the central strip may be easily removed because of its tapered shape and the slight resistance to such removal caused by the small brads.

WILLIAM C. JOHNSON 

